Electric heating element



June 18, 1929. BoLslNGER 1,718,106

ELECTRIC HEATING ELEMENT 7' Original Filed Oct. 8, 1927 i l iii i i' ijEjis: WWI

1 N V EN TORv SSBOISiHyer,

' ATOR BY. 7

Patented June 18, 1929.

UNITED STATES SAMUEL S. BOLSINGER, OF ROSEBURG, OREGON.

ELECTRIC HEATING ELEMENT.

Original application filed October 8, 1927, Serial No. 224,911.

This invention relates to an electric heater and is a division of myapplication filed October 8, 1927, Serial Number 224,911.

The primary object of the invention is to provide, in a manner ashereinafter set forth, a device for use in connection with gasoline orkerosene burners whereby the fire hazard, delay due to priming, andother objectionable features may be eliminated when it is desired tolight the burner.

A further objectof the invention is to provide a device for the purposeabove set forth which is simple in construction, inexpensive tomanufacture, strong, durable, compact, and which may be readilyinstalled with respect to the fuel feed. line leading to a gasoline orkerosene burner whereby the burner may be expeditiously lighted whendesired.

Other objects and advantages of the invention will be apparent duringthe course of the following description.

In the accompanying drawings in which like numerals are employed todesignate like parts throughout the same,

Figure 1 is a side elevation of a heating element constructed inaccordance with this invention, showing an adaptation of the same withrespect to a fuel feed line.

Figure 2 is a View similar to Figure 1, showmg the heating element inlongitudinal section.

Figure 3 is an end elevation of the heating element, showing the feedline upon which it is mounted in section.

Figure 4 is a detail View of the core in longitudinal section.

In the drawings wherein for the purpose of illustration is shown anembodiment of my invention, the numeral 1 designates a tubular coreadapted to be mounted on a fuel line 2. The core 1 may be formed fromany suitable material which is a con ductor of heat and a non-conductorof electricity and is provided with a continuous thread or groove 3extending circumferentially thcrcaround in a spiral formation to receivetherein the convolutions of a nichrome wire 4, the ends of which areadapted to be connected, as indicated at 5, with a source of electricalenergy, not shown. The thread 3 is of a depth substantially twice thediameter of the wire 4 to permit expansion of the wire with a minimumpressure by the convolutions thereof upon the core 1. The

Divided and this application filed August Serial No. 301,076.

spiral formation of the single thread 3 pcrmits a single length of wireto be used with the convolutions thereof encircling the core 1 in spiralformation and maintained in spaced relation, thereby eliminating anypossibility of the convolutions crowding together. In this manner, acontinuous con tact is established between the wire and core and thecontact is distributed evenly throughout the length of the core.

Mounted on the fuel line 2, adjacent the ends of the core 1, is a pairof heat confining collars or washers 6. The walls of the collars 6 arein alignment with the wall of the core 1 and the inner faces of thecollars 6 respectively abut the respective ends of the core 1. Mountedon the assembled core 1 and collars 6 is a heat confining, tubularjacket 7, the inner diameter of which is of appropriate size topermitthe jacket 7 to snugly receive the core 1 and collars 6 therein.The jacket 7 is of greater length than the core 1 but of less lengththan the combined length of the core 1 and collars 6. In the assembledrelation of the jacket 7, core 1, and collars 6, the outermost portionsof the latter project outwardly from the ends of the jacket 7. The wallof the jacket 7 is provided with a pair of spaced openings 8, which arerespectively disposed adjacent the respective ends of the thread 3, forthe passage thercthrough of the respective ends of the wire 1.

The jacket 7 and collars 6 may be formed of any suitable materialadapted to prevent or retard the heat from the convolutions of the wire4 from passing to the outer atmosphere. It is immaterial whether or notthe jacket and collars are formed of electricity conducting material,except that, if such ma terial be used, insulation of any suitable typewill be required for the walls of the openings 8. At all other pointsthe jacket 7, as well as the collars 6, are insulated from the wire 4 bythe core 1. hen the wire 4 is heated by means of its connection with asource of electrical energy, the heat is transmitted from theconvolutions of the wire, through the core 1 to the wall of the fuelline 2, thereby vaporizing the fuel within the line, whereby the fuelmay be readily ignited at the burner, not shown. After the currentpassing through the wire 4 is cut off, the heat is retained within thedevice by means of the jacket 7 and collars 6.

It isto be understood that the embodiment of invention herewith shownand described is to be taken as a preferred example of the same and thatVarious changes in the size, shape and arrangement of parts may beresorted to Without departing from the spirit of the invention asclaimed.

lVhat I claim is:

An electrical heater comprising, a heat conducting, electricityinsulating core adapted to be concentrically mounted on a fuel v line, atubular jacket surrounding said core and projecting from the endsthereof, said core being formed in its periphery with a continuousthread extending circumferem.

tially around the core inspiral formation,

said jacket being formed With a pair of V openings respectively spacedfrom the ends thereof, a single conductor formed With a series ofconvolutions seated in said thread and having its end portions extendingthrough said openings for connection With a source of electrical energy,said thread being of greater dept-h than the thickness of said conductorto permit expansion of the convolutions of the latter and maintain thesame in spaced relation to said jacket, and means at the ends of saidcore and extending into the ends of said jacket and coacting with thelatter to prevent the passage of heat from said core to the, outeratmosphere.

In testimony whereof, I aliix my signature thereto,

SAMUEL S. BOLSINGER.

